Fever is also known as hyperthermia, pyrexia, or elevated temperature. It describes a body temperature that's higher than normal. Fever can affect children and adults. A short-term increase in body temperature can help your body fight off illness.

Vomiting blood, or hematemesis, is the regurgitation of stomach contents mixed with blood, or the regurgitation of blood only. Vomiting blood can be a frightening experience, but in some cases it may be triggered by minor causes. This includes swa...

The color of vomited blood varies depending on the amount of time the blood has been in the gastrointestinal system. If there is a delay in vomiting, blood will appear dark red, brown or black and precipitated blood clots produce the appearance of coffee ground like material.

Bloody or tarry stools refer to a stool sample that's either dark red or black in color. Bloody or tarry stools can indicate bleeding or other injuries in your gastrointestinal tract. You may also have dark, discolored bowel movements after eating...

It is normal to have periods of low energy when one needs to rest and recuperate. However, if low energy persists and a person continually feels sluggish, disinterested in life, and has low energy, the situation should be investigated by a physician.